A spellbinding espionage thriller from the cold war period with an exceptional cast. The true story of Colonel Kukliński – apparently the greatest scourge of communism – whose cover name was Jack Strong. For him, the suppression of the Prague Spring was the last straw, after which he lost faith in the Soviet Union. He became a secret agent for the CIA and handed over to the west tens of thousands of pages from the most important files. However, in the eyes of many of his fellow citizens, he remains a traitor and gold-digger. It depicts the oppressive atmosphere behind the Iron Curtain and the breath-taking tension involved in playing on both sides. A masterpiece dealing with burning issues from the past.